Java SE 7 Language - Features and Enhancements

1. Java Programming Language –
Enhancements in Java SE 7
http://bit.ly/1pJcPiw

2. Java SE 7
• Binary Literals
– In Java SE 7, the integral types (byte, short, int, and long)
can also be expressed using the binary number system. To
specify a binary literal, add the prefix 0b or 0B to the
number.
– http://bit.ly/1yqIm7Q

3. Java SE 7
• Underscores in Numeric Literals
– Any number of underscore characters (_) can appear
anywhere between digits in a numerical literal. This feature
enables you, for example, to separate groups of digits in
numeric literals, which can improve the readability of your
code.
– http://bit.ly/1swjmIS

4. • Strings in switch Statements
– You can use the String class in the expression of a switch
statement.
– http://bit.ly/10RjCej
Java SE 7

5. Java SE 7
• Type Inference for Generic Instance Creation
– You can replace the type arguments required to invoke the
constructor of a generic class with an empty set of type
parameters (<>) as long as the compiler can infer the type
arguments from the context. This pair of angle brackets is
informally called the diamond.
– http://bit.ly/144Zw26

6. Java SE 7
• Improved Compiler Warnings and Errors When Using
Non-Reifiable Formal Parameters with Varargs
Methods
– The Java SE 7 complier generates a warning at the
declaration site of a varargs method or constructor with a
non-reifiable varargs formal parameter. Java SE 7 introduces
the compiler option -Xlint:varargs and the annotations
@SafeVarargs and @SuppressWarnings({"unchecked",
"varargs"}) to suppress these warnings.
– http://bit.ly/1GIAd4E

7. Java SE 7
• Catching Multiple Exception Types and Rethrowing
Exceptions with Improved Type Checking
– A single catch block can handle more than one type of exception.
In addition, the compiler performs more precise analysis of
rethrown exceptions than earlier releases of Java SE. This enables
you to specify more specific exception types in the throws clause
of a method declaration.
– http://bit.ly/11bIIVL

8. Java SE 7
• The try-with-resources Statement
– The try-with-resources statement is a try statement that declares
one or more resources. A resource is an object that must be closed
after the program is finished with it. The try-with-resources
statement ensures that each resource is closed at the end of the
statement. Any object that implements the new
java.lang.AutoCloseable interface or the java.io.Closeable
interface can be used as a resource. The classes
java.io.InputStream, OutputStream, Reader, Writer,
java.sql.Connection, Statement, and ResultSet have been
retrofitted to implement the AutoCloseable interface and can all
be used as resources in a try-with-resources statement.
– http://bit.ly/1xmwqVv